Stuffing-box.



No. 793,461. PATENTED JUNE 2'7, 1905.

R. L. MOSSMANI STUPPING BOX.

APPLICATION FILED NOV.8, 1904.

WITNESS/58.- INVE/VTOR /A //%Q E0945. fifoasnzan/ U ITED STATES Patented June 27, 1905.

PATENT OFFICE.

ROY LYNN MOSSMAN, OF NEWCASTLE, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO FRANK C. SCHORNDORFER, OF NEWCASTLE, PENN- SYLVANIA.

STUFFlNG-BOX.

SPECIFICATION forming part of Letters Patent No. 793,461, dated. June 2'7, 1905.

Application filed November 8, 1904. Serial No. 231,909.

To all whmn it Hen/y concern.-

Be it known that I, ROY LYNN MOSSMAN, a citizen of the United States, and a resident of Newcastle,in the county of Lawrence and State of Pennsylvania, have invented a new and Improved Stuffing-Box, of which the following is a full, clear, and exact description.

My invention relates to stuffing-boxes. The chief object thereof is to provide for permitting the packing of stufling-boxes while steam 1s on.

While my invention is capable of applica-- tion in many ways, it is especially valuable for use upon locomotives. Under ordinary conditions if the throttle-stem packing blows out it is necessary to draw the fire and blow off the steam before the stem can be repacked. Others have attempted to overcome this objection heretofore; but their devices were open to the objection that the throttle had to be open while packing. Consequently the valve-rod had to be disconnected and the ports covered, so as to permit the opening of the throttle. Even with the ports covered the opening of the throttle is a risky operation when the steam is on, and it also requires considerable manipulation and consumes time. By my invention these objections are all overcome, as the stem can be packed while the throttle is shut. In attaining thisobject I employ a principle which can be applied in many useful ways to other forms of mechanism, as will be seen.

Further objects of the invention will be disclosed in the course of the subjoined description.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of a structure embodying the principle of my invention and showing it applied to the boiler-head sheet,

elevation thereof, partly broken away, and Fig. 3 is a sectional View on the line 3 3 of Fig. 2.

The throttle-stern a is provided with a ring a, having a valve-surface (0 preferably conical in shape. Upon the throttle-stem fits a main stuffing-box 6, having a valve-seat b for receiving the conical surface a The throttle-stem passes through this stuffing-box in the usual manner, and a packing-gland c is provided and secured to the stuffing-box in the well-known way by means of bolts 0 or the like. Instead of being stationary, as usual, the stufling-box is mounted to' slide with respect to the boiler-head sheet 61, and screws 0 are provided for moving it longitudinally. These screws pass through a yoke f, mounted upon the outside of the stufiingboX. The inner ends of these screws are secured in a plate g, which is 1n turn secured,

by means of bolts g, to the boiler-head sheet.

It will be readily understood that by the turning of nuts e the yokef and stuffing-box b can be forced inward to a position such as that shown in Fig. 3, the gland 0 following the yoke f, to which it is secured.

The plate g is provided with a projection 9 which passes through an opening d in the head-sheet and is provided with a seat 9 within the boiler. Near the inner end of the stuffing-box is a conical valve-surface 6 which is adapted to engage with the seat 9, so as to prevent the passage of steam through the joint between the stufling-box proper and the projection g when the stufling-box is in its outermost position. The collar 9 is also provided with a chamber g", which constitutes a second stuffing-box and is provided with a gland IL. This gland is adjustably fixed with respect to its stuffing-box by means of bolts h or the like. A passage 6 leads from the interior of the stuffing-box Z) to a petcock 7c.

The operation of the device will be readily understood. When it is desired to pack the main stufling-box, the nuts 0 are screwed up,

so as to force the parts into the position shown in Fig. 3. In this position the seat I) is forced into operative connection with the valve a This prevents the steam from blowing into the main stuffing-box. The stuflingbox 9* also prevents steam from blowing out around the outside of the main stuffing-box. By turning the peteock 7n the operator can determine whether the valve (0 is firmly seated. or not, as if it is no steam will pass through the cock from the passage b The gland 0 can then be removed and the box packed in the usual way. After the replacement of the gland the nuts 0' can be unscrewed and the pressure of steam on the innerface of the box will force it out into the position shown in Fig. 1. In this position the valve 6 will be seated on the seat g, so as to prevent steam from passing into the box 9. The gland /L can then be removed and that box packed without danger of steam passing through it, and all parts will then be ready for use. The stem at can be rotated while the valve (4 is on its seat I), so as to remove scale and grind the two surfaces together to form a steam-tight joint. All these operations can be performed 7 while the steam is on the engine and while the throttle is shut. Therefore the valverods do not have to be disconnected nor the ports covered. Furthermore, it is not necessary to swivel the throttle-stem to provide a means for grinding the seat of the valve (0 as it can be done by the use of a spannerwrench applied to a hole Z in the box I). The valve-seat 9 can also be ground in the same manner. The outside stufiing-box can be packed at any time while the engine is in service, as the seat prevents steam from blowing into it except when the parts are in the position for packing the other box.

While 1 have described my invention with particular reference to its application to a locomotive, it will be readily understood that it can be used in other connections and that it may be embodied in other forms without departing from the spirit thereof.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination with a stem having a ring thereon, of a stuffing-box having a seat for said ring and a passage for the stem, a gland for said stuffing-box, and a collar in which said stufling-box is slidingly mounted, said stuffing-box being provided with a valvesurface near its inner end, and said collar being provided with a valve-seat therefor.

2. The combination with a stem having a Valve thereon, of amain stuffing-box provided with a passage for the stem, a seat for the valve and a gland, and a second stuffing-box mounted on the outside of the main stufiingbox and provided with a valve-seat, the main stufiing-bOx being provided near its inner end with a valve for said last-mentioned seat.

3. The combination with a stem having a ring-valve thereon, of a stuffing-box having a seat at its inner end for said valve, a passage for said stem and a passage from said first-mentioned passage to the exterior of the stuffing-box, a cock connected with said lastmentioned passage, a collar in which said stuffing-box is slidingly mounted, and means for preventing the exit of steam between the collar and the box.

4/ The combination with a stem having a ring-valve thereon, of a stuffing-box having a seat for said valve and a passage for the stem, and a collar mounted on the outside of said stufling-box and provided with a valveseat, said stuffing-box also having a valve near its inner end for said seat, and means for moving the stufling-box longitudinally within the collar.

5. The combination with the head-sheet of a boiler having a passage therethrough, of a collar mounted in said passage and provided with a valve-seat on its interior surface and a passage therethrough, a main stuffing-box removably mounted in said last-mentioned passage and provided with a valve surface near its inner end adapted to seat on said valve-seat, said main valve also being provided with a valve-seat on its inner end, and a throttle-stem passing through said main stuffing-box and provided with a valve adapted to be seated on said last-mentioned seat, said collar being provided with a stuffing-box fitting the exterior of said main stuffingbox.

6. The combination with the head-sheet of a boiler having a passage therethrough, of a collar mounted in said passage and provided with a valve-seat on its interior surface and a passage therethrough, a main stufiing-box removably mounted in said last-mentioned passage and provided with a valve-surface near its inner end adapted to seat on said valveseat, said main valve also being provided with a valve-seat on its inner end, a throttle-stem passing through said main stuffing-box and provided with a valve adapted to be seated on said last-mentioned seat, said collar being provided with a stuffing-box fitting the exterior of said main stufiing-box, and means for moving said main stufling-box longitudinally, whereby either the valve on the main stuffing-box or the valve on the throttle-stem can be brought to its seat.

7. The combination with a stem, of a stuff ing-box having a passage therefor and a passage from said first-mentioned passage to the exterior of the stuffing-box, and a cock communicating with said last-mentioned passage.

8. The combination with a stem, of a stuffing-box having a passage therefor and a passage from said first-mentioned passage to the boX and provided with a valve-seat, said stuffexterior of the stufling-box, a cock communiing-boX also having a valve near its inner end eating With said last-mentioned passage, a I for said seat.

collar in which said stuifing-box is slidingly In testimony WhereoiIhave signed my name mounted, and means for preventing the exit to this specification in the presence of two sub- I5 of steam or the like between the collar and scribing Witnesses.

ROY LYNN MOSSMAN.

box.

9. The combination with a stem, of a stuff- Witnesses: ing-box havinga passage therefor, and a col- 1. P. DEAN,

lar mounted on the outside of said stufiing- F. G. SHORNDORFER 

